What is known as strength of ear's perception of sound?
- ✓Loudness
- BIntensity
- CFrequency
- DAmplitude
Answer: A.
View full solution →Question types
Sound question types
598 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
598
Questions
9
Question groups
5
Question types
01
M.C.Q. [1 M]
174 Q→02Assertion (A) & Reason (B) MCQ
5 Q→03true or false
4 Q→04Fill in the blank
15 Q→05Do as directed; [1 M ]
115 Q→06Que-Ans (Each of 2 Mark )
226 Q→07Que-Ans (Each of 3 Mark )
35 Q→08Que-Ans (Each of 5 Mark )
19 Q→09Case study ( 4 Marks )
5 Q→Sample Questions
Sound questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
The speed of highly penetrating ultrasonic waves is:
- ALower than those of audible sound waves.
- BHigher than those of audible sound waves.
- CMuch higher than those of audible sound waves.
- ✓Same as those of audible sound waves.
Answer: D.
View full solution →The sound waves travel fastest:
- ✓In solids.
- BIn liquids.
- CIn gases.
- DIn vacuum.
Answer: A.
View full solution →A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case:
- ASound will be louder but pitch will not be different.
- BSound will be louder and pitch will also be higher.
- ✓Sound will be louder but pitch will be lower.
- DBoth loudness and pitch will remain unaffected.
Answer: C.
View full solution →Why do we not hear the screams of a bat:
- AScreams are below $30,000\ Hz$
- BThe screams are infrasonic
- ✓The screams are ultrasonic
- DAll
Answer: C.
View full solution →In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: $SONAR$ sound cannot be audible to human ear inside water.
Reason: Human ears are able to sense ultrasonic sound as it has high frequency.
Assertion: $SONAR$ sound cannot be audible to human ear inside water.
Reason: Human ears are able to sense ultrasonic sound as it has high frequency.
- ABoth the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
- BThe Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
- ✓Assertion is true but the Reason is false.
- DThe statement of the Assertion is false but the Reason is true.
Answer: C.
View full solution →A statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as
Assertion: Ultrasonic sound is used in industry for detecting flaws (cracks etc) in metal blocks without damaging them.
Reason: An internal crack (or hole) does not allow ultrasound to poss through it.
Assertion: Ultrasonic sound is used in industry for detecting flaws (cracks etc) in metal blocks without damaging them.
Reason: An internal crack (or hole) does not allow ultrasound to poss through it.
- ✓If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
- CIf Assertion is true, but Reason is false.
- DIf Assertion is false, but Reason is true.
Answer: A.
View full solution →In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Sound produced on the stage of a hall should spread uniformly across the hall.
Reason: Reflection of sound does not occur from polished or smooth surfaces.
Assertion: Sound produced on the stage of a hall should spread uniformly across the hall.
Reason: Reflection of sound does not occur from polished or smooth surfaces.
- ABoth the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
- BThe Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
- ✓Assertion is true but the Reason is false.
- DThe statement of the Assertion is false but the Reason is true.
Answer: C.
View full solution →A statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
Assertion: Sound wave is an electromagnetic wave.
Reason: Speed of sound in solid is less than air.
Assertion: Sound wave is an electromagnetic wave.
Reason: Speed of sound in solid is less than air.
- AIf both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
- CIf Assertion is true, but Reason is false.
- ✓If Assertion and Reason both are false.
Answer: D.
View full solution →A statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as
Assertion: The loudness of sound is measured in decibel.
Reason: If sound waves have a large amplitude then the sound will be loud.
Assertion: The loudness of sound is measured in decibel.
Reason: If sound waves have a large amplitude then the sound will be loud.
- ✓If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
- CIf Assertion is true, but Reason is false.
- DIf Assertion is false, but Reason is true.
Answer: A.
View full solution →Echo can be heard in every room. [True/ False]
Sound waves travel slower in vacuum than in water. [True/ False]
State whether the following statement is true or false: Sound produced by a vibrating body travels to our ears by the actual movement of air.
Ultrasound can be used to test planeness of metal sheets. [True/ False]
Fill in the following blanks with suitable word: When the frequency of the sound is increased, the wavelength ______.
Fill in the following blanks with suitable word: Loudness of sound depends on _____.
Fill in the following blanks with suitable word: Sound cannot travel through _____.
Fill in the following blanks with suitable word: An echo is simply a ______ Sound.
Light travels ________ than sound, thus, flash of lightning is seen much ________ than the sound of thunder is heard.
A bomb explodes on the moon. How long will it take for the sound to reach the earth$?$
- A$10$ seconds
- B$1000$ seconds
- C$1$ day
- ✓None of these
Answer: D.
View full solution →A tuning fork has a number $256$ marked on it. What does this number signify$?$
View full solution →What is the minimum distance in air required from a sound reflecting surface to hear an echo $($at $20^{\circ} \mathrm{C} )?$
View full solution → What name is given to those aircrafts which fly at speeds greater than the speed of sound?
Which of the following cannot transmit sound? Water, Vacuum, Aluminium, Oxygen gas.
Find the energy possessed by an object of mass $10\ kg$ when it is at a height of $6\ m$ above the ground. $\left[g=9.8 \mathrm{~ms}^{-1}\right]$
View full solution →A trolley is pushed along a road with a force of $400N$ through a distance of $60m$ in 1 minute. Calculate the power developed.
View full solution →State law of conservation of energy.
Two bodies having equal masses are moving with uniform speeds of $v$ and $2v$ respectively. Find the ratio of their kinetic energies.
View full solution →In an experiment to measure his power, a student records the time taken by him in running in a flight of steps on a staircase. Use the following data to calculate the power of the student: Number of steps = $28$ Height of each step = $20cm$ Time taken = $5.4s$ Mass of student = $55kg$ Acceleration = $9.8ms^{-2}$ Due to gravity.
View full solution →What is the range of frequencies associated with $(a)$ infrasound $(b)$ audible sound, and $(c)$ ultrasound$?$
View full solution →Distinguish between loudness and intensity of sound.
Why do we hear more clearly in a room with curtains then a room withour curtains?
Give reason for the following: In most of the cases, we cannot see the vibrations of a sound producing object with our eyes.
Explain how the human ear works.
How does sound from a sound producing body travel through air to reach our ears? Illustrate your answer with the help of a labelled diagram.
Explain the terms 'compression' and 'rarefactions' of a wave. What type of waves consist of compressions and rarefactions?
Consider the following sound waves marked $A, B, C$ and $D:$
View full solution →- Which two waves represent sounds of the same loudness but different pitch$?$
- Which two waves represent sounds of the same frequency but different loudness?
- State whether all these sound waves have been produced by the same vibrating body or different vibrating bodies?
- Which vibrating body/bodies could have generated the sound waves shown here$?$
How can reverberations in a big hall or auditotium be reduced?`
In an experiment, Anhad studies sound waves. He sets up a loudspeaker to produce sound as shown below:
Anhad adjusts the signal to the loudspeaker to give a sound of frequency $200Hz.$
- What happens to the air in-between Anhas and the loudspeaker$?$
- Explain how Anhad receives sound in both ears.
Sound bounces off a solid or a liquid like a rubber ball bounces off a wall. Like light, soundgets reflected at the surface of a solid or liquid and follows the same laws of reflection. The directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence, and the three are in the same plane. If we clap near a suitable reflecting object such as a tall building or a mountain, we will hear the same sound again a little later. This sound which we hear is called an echo. The sensation of sound persists in our brain for about $0.1\ s$. To hear a distinct echo the time interval between the original sound and the reflected one must be at least $0.1\ s$. Hence, for hearingdistinct echoes, the minimum distance of theobstacle from the source of sound must be $17.2\ m$. Thisdistance will change with the temperature ofair. Another phenomenon of reflection of sound is reverberation.A sound created in a big hall will persist byrepeated reflection from the walls until it isreduced to a value where it is no longeraudible. The repeated reflection that resultsin this persistence of sound is called reverberation. Excessive reverberation is highly undesirable.
(i) Which of the following is true related to reflection of sound?
$(a)$ Directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence.
$(b)$ Incident wave reflected wave and normal lies in same plane
$(c)$ Both a and b are true.
$(d)$ None of these
(ii)For hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be
$(a)$ $10m$
$(b)$ $20m$
$(c)$ $17.2m$
$(d)$ None of these
(iii) Excessive reverberation is
$(a)$ Desirable phenomenon
$(b)$ Undesirable phenomenon
$(c)$ Does not exist
$(d)$ None of these
(iv) A person makes sound near a obstacle and heard the echo after 1 s. What is the distance of the obstacle from the person if the speed of the sound, v is taken as 346 m/s?
(v) State law of reflection of sound.
View full solution →(i) Which of the following is true related to reflection of sound?
$(a)$ Directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence.
$(b)$ Incident wave reflected wave and normal lies in same plane
$(c)$ Both a and b are true.
$(d)$ None of these
(ii)For hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be
$(a)$ $10m$
$(b)$ $20m$
$(c)$ $17.2m$
$(d)$ None of these
(iii) Excessive reverberation is
$(a)$ Desirable phenomenon
$(b)$ Undesirable phenomenon
$(c)$ Does not exist
$(d)$ None of these
(iv) A person makes sound near a obstacle and heard the echo after 1 s. What is the distance of the obstacle from the person if the speed of the sound, v is taken as 346 m/s?
(v) State law of reflection of sound.
A violin and a flute may both be played the same time in an orchestra. Bothsounds travel through the same medium,that is, air and arrive at our ear at the sametime. Both sounds travel at the same speedirrespective of the source. But the soundswe receive are different. This is due to thedifferent characteristics associated with thesound. Pitch is one of the characteristics.How the brain interprets the frequency ofan emitted sound is called its pitch. The fasterthe vibration of the source, the higher is the frequency and the higher is the pitch. The magnitude of the maximumdisturbance in the medium on either side ofthe mean value is called the amplitude of thewave. It is usually represented by the letter $(A)$.The loudness or softness of a sound isdetermined basically by its amplitude. Theamplitude of the sound wave depends uponthe force with which an object is made tovibrate. If we strike a table lightly, we hear asoft sound because we produce a sound waveof less energy (amplitude).
The quality or timber of sound is thatcharacteristic which enables us to distinguishone sound from another having the same pitchand loudness. The sound which is morepleasant is said to be of a rich quality. A sound of single frequency is called a tone. The sound which is produced due to a mixture of several frequencies is called a note and is pleasant to listen to. Noise is unpleasant to the ear! Music is pleasant to hear and is of rich quality.
(i) Pitch of sound is higher when
$(a)$ Vibration of source of sound is higher
$(b)$ Vibration of source of sound is Lower
$(c)$ Independent of vibration of source of sound
$(d)$ None of these
(ii) Loudness and softness of sound depends upon
$(a)$ Frequency of sound
$(b)$ Amplitude of sound
$(c)$ Wavelength of sound
$(d)$ None of these
(iii) Sound of single frequency is called
$(a)$ Note
$(b)$ Tone
$(c)$ Noise
$(d)$ None of these
(iv)If we strike a table lightly, we hear asoft sound. If we hit the tablehard we hear a louder sound up to large distance. Why?
(v) Determine which of the following has higher pitch railway horn or guitar?
View full solution →The quality or timber of sound is thatcharacteristic which enables us to distinguishone sound from another having the same pitchand loudness. The sound which is morepleasant is said to be of a rich quality. A sound of single frequency is called a tone. The sound which is produced due to a mixture of several frequencies is called a note and is pleasant to listen to. Noise is unpleasant to the ear! Music is pleasant to hear and is of rich quality.
(i) Pitch of sound is higher when
$(a)$ Vibration of source of sound is higher
$(b)$ Vibration of source of sound is Lower
$(c)$ Independent of vibration of source of sound
$(d)$ None of these
(ii) Loudness and softness of sound depends upon
$(a)$ Frequency of sound
$(b)$ Amplitude of sound
$(c)$ Wavelength of sound
$(d)$ None of these
(iii) Sound of single frequency is called
$(a)$ Note
$(b)$ Tone
$(c)$ Noise
$(d)$ None of these
(iv)If we strike a table lightly, we hear asoft sound. If we hit the tablehard we hear a louder sound up to large distance. Why?
(v) Determine which of the following has higher pitch railway horn or guitar?
- The distance between two consecutivecompressions $(C)$ or two consecutiverarefactions $(R)$ is called the wavelength.The wavelength is usually represented by λ (Greek letter lambda). Its $SI$ unit is meter $(m)$.
•If we can count the number of the compressions or rarefactions that cross us per unit time, we will get the frequency of the sound wave. It is usually represented by υ (Greek letter, nu). $SI$ unit is hertz (symbol, Hz).
•The time taken for one complete oscillation is called the time period of the sound wave. It is represented by the symbol T. Its $SI$ unit is second $(s)$.Frequency and time period are related asfollows: $υ=1/\lambda $
•The speed of sound is defined as the distance which a point on a wave, such as a compression or a rarefaction, travels per unit time.
$v= \lambda /T = υ\lambda $
(i) SI unit of wavelength
$(a)$ m
$(b)$ Hertz
$(c)$ m/s
$(d)$ None of these
(ii)SI unit of Frequency
$(a)$ m
$(b)$ Hertz
$(c)$ m/s
$(d)$ None of these
(iii) Relation between frequency and time is given by
$(a)$ frequency and time are directly proportional
$(b)$ frequency and time are inversely proportional
$(c)$ There is no relation between them
$(d)$ None of these
$(iv)$ Define speed of sound. Give its formula in terms of wavelength and frequency
$(v)$ Define wavelength frequency and time period of longitudinal wave
The individual particlesof the medium move in a direction parallel tothe direction of propagation of thedisturbance. The particles do not move fromone place to another but they simply oscillateback and forth about their position of rest.This is exactly how a sound wave propagates;hence sound waves are longitudinal waves.There is also another type of wave, calleda transverse wave. In a transverse waveparticles do not oscillate along the direction of wave propagation but oscillate up and downabout their mean position as the wave travels.Thus, a transverse wave is the one in whichthe individual particles of the medium move about their mean positions in a directionperpendicular to the direction of wavepropagation.
(i) Sound waves are
$(a)$ Transverse waves
$(b)$ Longitudinal wave
$(c)$ Both $a$ and $b$
$(d)$ None of these
(ii) Light is
$(a)$ Transverse waves
$(b)$ Longitudinal wave
$(c)$ Both $a$ and $b$
$(d)$ None of these
(iii) In case of Longitudinal waves
$(a)$ The particles do not move fromone place to another but they simply oscillateback and forth about their position of rest
$(b)$ The particles move fromone place to another
$(c)$ The particles move up and down.
$(d)$ None of these
(iv) When stone is dropped in water; waves are generated of which types?
(v) Differentiate between longitudinal wave and transverse waves.
View full solution →(i) Sound waves are
$(a)$ Transverse waves
$(b)$ Longitudinal wave
$(c)$ Both $a$ and $b$
$(d)$ None of these
(ii) Light is
$(a)$ Transverse waves
$(b)$ Longitudinal wave
$(c)$ Both $a$ and $b$
$(d)$ None of these
(iii) In case of Longitudinal waves
$(a)$ The particles do not move fromone place to another but they simply oscillateback and forth about their position of rest
$(b)$ The particles move fromone place to another
$(c)$ The particles move up and down.
$(d)$ None of these
(iv) When stone is dropped in water; waves are generated of which types?
(v) Differentiate between longitudinal wave and transverse waves.
Sound is produced by vibrating objects. The matter or substance through which sound is transmitted is called a medium. It can be solid, liquid or gas. Sound moves through a medium from the point of generation to the listener. When an object vibrates, it sets the particles of the medium around it vibrating. The particles do not travel all the way from the vibrating object to the ear. Sound waves are characterized by the motion of particles in the medium and are called mechanical waves.When a vibrating objectmoves forward, it pushes and compresses theair in front of it creating a region of highpressure; this region is called a compression$(C)$.When the vibrating object moves backwards,it creates a region of low pressure calledrarefaction $(R)$. Hence sound is longitudinal wave.
(i) Sound waves are
$(a)$ Mechanical waves
$(b)$ Electromagnetic wave
$(c)$ Transverse waves
$(d)$ None of these
(ii) Sound travel in medium with
$(a)$ Compression and rare fraction
$(b)$ Crest and trough
$(c)$ Both can be possible
$(d)$ None of these
(iii) Compression is the region of
$(a)$ High pressure
$(b)$ Low pressure
$(c)$ Medium pressure
$(d)$ None of these
(iv) What is sound and how is it produced?
(v) Why sound wave is called as longitudinal wave?
View full solution →(i) Sound waves are
$(a)$ Mechanical waves
$(b)$ Electromagnetic wave
$(c)$ Transverse waves
$(d)$ None of these
(ii) Sound travel in medium with
$(a)$ Compression and rare fraction
$(b)$ Crest and trough
$(c)$ Both can be possible
$(d)$ None of these
(iii) Compression is the region of
$(a)$ High pressure
$(b)$ Low pressure
$(c)$ Medium pressure
$(d)$ None of these
(iv) What is sound and how is it produced?
(v) Why sound wave is called as longitudinal wave?
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